65666873 has 2 divisors, whose sum is σ = 65666874. Its totient is φ = 65666872.

The previous prime is 65666857. The next prime is 65666879. The reversal of 65666873 is 37866656.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36808489 + 28858384 = 6067^2 + 5372^2 .

It is a cyclic number.

It is not a de Polignac number, because 65666873 - 2⁴ = 65666857 is a prime.

It is not a weakly prime, because it can be changed into another prime (65666879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32833436 + 32833437.

It is an arithmetic number, because the mean of its divisors is an integer number (32833437).

Almost surely, 2^65666873 is an apocalyptic number.

It is an amenable number.

65666873 is a deficient number, since it is larger than the sum of its proper divisors (1).

65666873 is an equidigital number, since it uses as much as digits as its factorization.

65666873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 47.

The square root of 65666873 is about 8103.5099185476. The cubic root of 65666873 is about 403.4429325966.

The spelling of 65666873 in words is "sixty-five million, six hundred sixty-six thousand, eight hundred seventy-three".